[tz] Asia/Shanghai error?

[Tim Hitchins]

> Possibly: Asia/Shanghai time currently (2024) has NO DST-rule

Correct, the last DST transition was Sep 1991 and since then the time zone Asia/Shanghai has always remained on standard time.

That ruleset (i.e. no transitions since Sept 1991) is still in effect for Shanghai (China).

> The local time Asia/Shanghai refers to a non-existing rule

The rule certainly still exists - you included a copy of it in your email!

Tim

________________________________
From: tz <tz-bounces at iana.org> on behalf of Komka Péter via tz <tz at iana.org>
Sent: 13 March 2024 17:03
To: tz at iana.org <tz at iana.org>
Subject: [tz] Asia/Shanghai error?

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Hi,


tzdata2024a contains (erroneously?):

# Zone  NAME            STDOFF  RULES   FORMAT  [UNTIL]
# Beijing time, used throughout China; represented by Shanghai.
                #STDOFF 8:05:43.2
Zone    Asia/Shanghai   8:05:43 -       LMT     1901
                        8:00    Shang   C%sT    1949 May 28
                        8:00    PRC     C%sT                 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
# Xinjiang time, used by many in western China; represented by Ürümqi / Ürümchi
# / Wulumuqi.  (Please use Asia/Shanghai if you prefer Beijing time.)
Zone    Asia/Urumqi     5:50:20 -       LMT     1928
                        6:00    -       +06


Shanghai refers to the rule "PRC".

# Rule  NAME    FROM    TO      -       IN      ON      AT      SAVE    LETTER/S
Rule    PRC     1986    only    -       May      4       2:00   1:00    D
Rule    PRC     1986    1991    -       Sep     Sun>=11  2:00   0       S
Rule    PRC     1987    1991    -       Apr     Sun>=11  2:00   1:00    D


Rule PRC was only in use until 1991.
Currently, in 2024, there is no rule "PRC" in use.
The local time Asia/Shanghai refers to a non-existing rule.


Possibly: Asia/Shanghai time currently (2024) has NO DST-rule. Similarly to Asia/Urumqi.
https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FChina&data=05%7C02%7CTim.Hitchins%40ekkosense.co.uk%7Cfba3e82156fd495a0e5c08dc4382e417%7C0fadb027642941ef8483b513e74ad1bf%7C0%7C0%7C638459476669322329%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=Eq9%2FYMdeFnRUAwh2XKAU0J7zDxYbv%2Fs9xQnsrTFxKmE%3D&reserved=0<https://en.wikipedia.org/wiki/China>  says: "Time zone   UTC+8 (CST) / DST is not observed."
https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.timeanddate.com%2Fworldclock%2Fchina&data=05%7C02%7CTim.Hitchins%40ekkosense.co.uk%7Cfba3e82156fd495a0e5c08dc4382e417%7C0fadb027642941ef8483b513e74ad1bf%7C0%7C0%7C638459476669332342%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=jXFztWiKwx%2BG%2FKX8vJv6K7hBKyZmU2uK3LXJNaYeRZg%3D&reserved=0<https://www.timeanddate.com/worldclock/china>  shows: there is [officially] only one time in China,
"CST", "UTC +8". Even is Ürümqi.
https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.timeanddate.com%2Ftime%2Fchange%2Fchina&data=05%7C02%7CTim.Hitchins%40ekkosense.co.uk%7Cfba3e82156fd495a0e5c08dc4382e417%7C0fadb027642941ef8483b513e74ad1bf%7C0%7C0%7C638459476669336190%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=OXUrdwbN1jmt6%2Fo5sXmHEv6xoyEDzly8WWorgLG0sOE%3D&reserved=0<https://www.timeanddate.com/time/change/china>  (a sub-link from the previos link)
"Daylight Saving Time (DST) Not Observed in Year 2024"
"The previous DST change in China was on 15 September 1991."



--
Komka Peter
(please do not spam)



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